How long is the flight?

The flight from SEA to DEN is about 2.5 hours.

Is driving recommended?

Only for those who enjoy long road trips; it is very tiring.

What is the best way to get around Denver?

A rental car or public transit are both good options.

Amtrak offers service, but it takes significantly longer than flying.

Yes, but it can be very windy and prone to snow in winter.

Leavenworth

Denver

Flight Driving

Leavenworth to Denver

Updated: 28 May 2026

The journey from Leavenworth to Denver covers approximately 1,900 kilometers. The most efficient way to travel is by flying from Seattle-Tacoma International Airport (SEA) to Denver International Airport (DEN), which takes about 2.5 hours in the air. Driving is a long, scenic trip, requiring roughly 19 hours of driving time via I-90 and I-80. Denver is known for its proximity to the Rocky Mountains, craft beer scene, and outdoor activities. This route takes you through the Pacific Northwest and the Great Plains.

Total Distance: 1,950 km driving distance; 1,700 km straight-line air distance.

Fastest Way

Flying from SEA to DEN is the fastest way to reach Denver.

Cheapest Way

Flying is often cheaper than the fuel and hotel costs of a 19-hour drive.

Compare Leavenworth to Denver Routes

	Flight Direct	Driving Direct
Duration	2 hours 30 mins (flight time)	19 hours
Avg Price	$150-$350	$250-$350 in fuel
Operator	United Airlines	Personal Vehicle
Route	SEA to DEN.	I-90 E to I-80 E.
Tip	Direct flights are frequently available from SEA.	Plan for at least one overnight stop if driving.

Travel Tips

Airport Transit
Allow 2.5 hours to drive from Leavenworth to SEA airport.
Driving Strategy
If driving, stop in Billings or Cheyenne to break up the journey.
Traffic
Denver traffic can be heavy; use navigation apps to plan your driving times.
Altitude
Denver is at a high altitude; drink plenty of water to avoid altitude sickness.
Weather
Weather can change rapidly; bring layers for all seasons.

Safety Tips

Driving Fatigue
Take frequent breaks on the long drive to stay alert.
Personal Safety
Be aware of your surroundings in crowded tourist areas.
Airport Security
Arrive at SEA at least 2 hours before your flight.
Vehicle Maintenance
Ensure your car is in top condition before attempting a 19-hour drive.